<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>列表排序</title>
    <script type="text/javascript" src="./../vue.js/vue.js"></script>
  </head>

  <body>
    <div id="root">
      <h2>人员列表</h2>
      <input type="text" placeholder="请输入名字" v-model="keyWord" />
      <button @click="sortType = 2">年龄升序</button>
      <button @click="sortType = 1">年龄降序</button>
      <button @click="sortType = 0">原顺序</button>
      <ul>
        <li v-for="(p,index) of fillPerson" :key="p.id">
          {{p.name}}-{{p.age}}-{{p.sex}}
          <input type="text" />
        </li>
      </ul>
    </div>

    <script type="text/javascript">
      Vue.config.productionTip = false;

      // 用 watch 实现
      // #region
      // new Vue({
      // 	el:'#root',
      // 	data:{
      // 		keyWord: '',
      // 		sortType: 0,
      // 		persons:[
      // 			{id:'001',name:'马冬梅',age:30,sex:'女'},
      // 			{id:'002',name:'周冬雨',age:31,sex:'女'},
      // 			{id:'003',name:'周杰伦',age:18,sex:'男'},
      // 			{id:'004',name:'温兆伦',age:19,sex:'男'}
      // 		],
      // 		fillPerson: []
      // 	},
      // 	watch: {
      // 		keyWord: {
      // 			immediate: true,
      // 			handler(val) {
      // 				this.fillPerson = this.persons.filter( item => item.name.indexOf(val) !== -1 )
      // 			}
      // 		},
      // 		sortType () {
      // 			if(!this.sortType) {
      // 				this.fillPerson = this.persons
      // 			}
      // 			else{
      // 				this.fillPerson.sort( (min, max) => this.sortType === 1 ? max.age-min.age : min.age-max.age )
      // 			}
      // 		}
      // 	}
      // })
      // #endregion

      // 用 computed实现
      new Vue({
        el: "#root",
        data: {
          keyWord: "",
          sortType: 0, //0原顺序 1降序 2升序
          persons: [
            { id: "001", name: "马冬梅", age: 30, sex: "女" },
            { id: "002", name: "周冬雨", age: 31, sex: "女" },
            { id: "003", name: "周杰伦", age: 18, sex: "男" },
            { id: "004", name: "温兆伦", age: 19, sex: "男" },
          ],
        },
        computed: {
          fillPerson() {
            const arr = this.persons.filter(
              (item) => item.name.indexOf(this.keyWord) !== -1
            );

            //判断一下是否需要排序
            if (this.sortType) {
              arr.sort((min, max) =>
                this.sortType === 1 ? max.age - min.age : min.age - max.age
              );
            }

            return arr;
          },
        },
      });
    </script>
  </body>
</html>
